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Swift SIL: escape effects for function arguments.

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Store a list of argument effects in a function, which specify if and how arguments escape.
Such effects can be specified in the Swift source code (for details see docs/ReferenceGuides/UnderscoredAttributes.md) or derived in an optimization pass.

For details see the documentation in SwiftCompilerSources/Sources/SIL/Effects.swift.
This commit is contained in:
Erik Eckstein
2021-09-24 10:22:31 +02:00
parent 72fc4e3c95
commit f09dfc93a9
21 changed files with 836 additions and 35 deletions
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33
lib/SIL/IR/SILFunctionBuilder.cpp
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@@ -15,6 +15,7 @@
#include "swift/AST/Availability.h"
#include "swift/AST/DiagnosticsParse.h"
#include "swift/AST/Decl.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/SemanticAttrs.h"
using namespace swift;
@@ -115,7 +116,37 @@ void SILFunctionBuilder::addFunctionAttributes(
}
}
// TODO: handle custom effects.
if (!customEffects.empty()) {
llvm::SmallVector<StringRef, 8> paramNames;
auto *fnDecl = cast<AbstractFunctionDecl>(constant.getDecl());
if (ParameterList *paramList = fnDecl->getParameters()) {
for (ParamDecl *pd : *paramList) {
// Give up on tuples. Their elements are added as individual
// argumenst. It destroys the 1-1 relation ship between parameters
// and arguments.
if (isa<TupleType>(CanType(pd->getType())))
break;
// First try the "local" parameter name. If there is none, use the
// API name. E.g. `foo(apiName localName: Type) {}`
StringRef name = pd->getName().str();
if (name.empty())
name = pd->getArgumentName().str();
if (!name.empty())
paramNames.push_back(name);
}
}
for (const EffectsAttr *effectsAttr : llvm::reverse(customEffects)) {
auto error = F->parseEffects(effectsAttr->getCustomString(),
/*fromSIL*/ false, /*isDerived*/ false, paramNames);
if (error.first) {
SourceLoc loc = effectsAttr->getCustomStringLocation();
if (loc.isValid())
loc = loc.getAdvancedLoc(error.second);
mod.getASTContext().Diags.diagnose(loc,
diag::warning_in_effects_attribute, StringRef(error.first));
}
}
}
if (auto *OA = Attrs.getAttribute<OptimizeAttr>()) {
F->setOptimizationMode(OA->getMode());